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 *   Copyright (c) 2022 Huawei Device Co., Ltd.
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import JISDistributionAnalysis from './JISDistributionAnalysis';

class SJISDistributionAnalysis extends JISDistributionAnalysis {
  ////////////////////////////////////////////////////////////////
  // constants
  ////////////////////////////////////////////////////////////////
  public static  HIGHBYTE_BEGIN_1:number = 0x81;
  public static  HIGHBYTE_END_1:number= 0x9F;
  public static  HIGHBYTE_BEGIN_2:number = 0xE0;
  public static  HIGHBYTE_END_2:number = 0xEF;
  public static  LOWBYTE_BEGIN_1:number = 0x40;
  public static  LOWBYTE_BEGIN_2:number = 0x80;

  ////////////////////////////////////////////////////////////////
  // methods
  ////////////////////////////////////////////////////////////////
  public constructor(){
    super();
  }

  protected getOrder(buf:ArrayBuffer , offset:number) {
    let order:number = -1;
    const intArray =new Int8Array(buf)
    let highbyte:number = intArray[offset] & 0xFF;
    if (highbyte >= SJISDistributionAnalysis.HIGHBYTE_BEGIN_1 && highbyte <= SJISDistributionAnalysis.HIGHBYTE_END_1) {
      order = 188 * (highbyte - SJISDistributionAnalysis.HIGHBYTE_BEGIN_1);
    } else if (highbyte >= SJISDistributionAnalysis.HIGHBYTE_BEGIN_2 && highbyte <= SJISDistributionAnalysis.HIGHBYTE_END_2) {
      order = 188 * (highbyte - SJISDistributionAnalysis.HIGHBYTE_BEGIN_2 + 31);
    } else {
      return -1;
    }
    let lowbyte = intArray[offset+1] & 0xFF;
     order += lowbyte - SJISDistributionAnalysis.LOWBYTE_BEGIN_1;
    if (lowbyte >= SJISDistributionAnalysis.LOWBYTE_BEGIN_2) {
      --order;
    }
    return order;
  }
}

export default SJISDistributionAnalysis